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https://issues.apache.org/jira/browse/LUCENE-4317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13438645#comment-13438645
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Uwe Schindler commented on LUCENE-4317:
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I wanted to add: The StringTokenStream in Field.java has one good thing: It
does not copy too often. The String is used directly to populate CTA. With
KeywordAnalyzer you do crazy per-char loops for nothing. In general we should
maybe also add new KeywordTokenizer(String), setString(String) for easy use.
> Field.java does not reuse its inlined Keyword-TokenStream
> ---------------------------------------------------------
>
> Key: LUCENE-4317
> URL: https://issues.apache.org/jira/browse/LUCENE-4317
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.0-BETA
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 5.0, 4.0
>
> Attachments: LUCENE-4317.patch
>
>
> Field.java contains a inlined Keyword-TokenStream. Unfortunately this one is
> recreated all the time, although one reuses the same Field instance. For
> NumericTokenStream Field.java reuses it, but the Keyword one not.
> We should apply the same logic and lazy init the TokenStream with a setter
> for the String value and reset(). This would be looking identical to
> SetNumeric(xx).
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